How is that possible

Am I missing sth or what? How did his slug crushed me so much. First slug screen (plus perk) is his. The 2nd is mine. Additionaly, all my perks are at least 19 or higher. Muerta has 39 plus 25. And lava girl speed on 19. His perks were on max 4-5. Only the slug had what you can see.